交叉式桁架臂弦杆单肢屈曲长度系数研究  

RESEARCH ON CHORD-BUCKLING-LENGTH COEFFICIENT OF CROSS-TYPE LATTICE BOOM

作　　者：成凯[1] 赵二飞[1] 周振平[1] 孙武和[1] 

机构地区：[1]吉林大学机械科学与工程学院,吉林长春130022

出　　处：《工程力学》2015年第6期215-221,共7页Engineering Mechanics

摘　　要：该文针对起重机一种常用的交叉式桁架结构提出了一个简化的屈曲分析模型。考虑腹杆对弦杆的限制作用,利用梁柱理论,建立简化的力学模型,利用MATLAB软件求解弦杆的屈曲载荷。通过和实际结构有限元分析得到的屈曲载荷的比较,验证了所提模型的正确性和可靠性。然后对2组腹杆的影响程度分别进行了分析,确定了起主要作用和次要作用的腹杆。忽略起次要作用的腹杆,重新推导力学模型,并对结果进行了深入的研究,实现了一种简单的确定弦杆长度系数的方法,极大的方便了工程实际的应用。The cross-type truss structure commonly used in cranes is reasonably simplified to attain the buckling load of a single chord, considering the constraint effect of the web members connected with the chord. A corresponding simplified mechanical model was established through beam-column theory, and then the buckling load of the chord was solved using MATLAB software. The results were proved to be correct and reliable by the comparison between the results of the simplified model and those of the actual structure using finite element method. Then, according to the comparison of the effect to the buckling load of the two groups of web members, the roles of the two groups were determined. Finally, ignoring the secondary web members, the mechanical model was rebuilt again and a simplified method was established to determine the length factor of the chord, which greatly facilitated the practical application of engineering problems.

关 键 词：交叉式 桁架臂 弦杆 长度系数 屈曲载荷 梁柱理论 

分 类 号：TH21[机械工程—机械制造及自动化]